OK here it is, if you look real close at the tracks in question a coyotes front paws are larger than the rear and almost always shows the nail print in them. The reason being that it is easier for them to catch smaller prey with the larger front paws.A domastic dogs tracks are all the same size.This is what I have read on I think it was Varmint Al's website. And as far as walking in a straight line that is false also. If that were the case I would think that any predator would miss out on alot of meals and walk on past them.